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y <br /> — _- <br /> � 4 <br /> ^5 <br /> k <br /> Job No. 00770 Page: 4 <br /> WELL CONCENTRATION Ip:-?m? <br /> VW-7 1,200 <br /> VW-4 2,000 <br /> VW-5 27,000 <br /> V14-6 25,500 <br /> The study was performed at the well heads because existing <br /> piping was not connected to the wells. consistent <br /> extraction volumes were exhibited at the wells with 24.0 to <br /> 25.0 cfm at 2.5" Hg. The soil permeability at each well <br /> within the impacted area indicates that site lithology is <br /> Wvery favorable to vacuum extraction. Vapor well VW-4 was <br /> a impermeable when the vacuum was first applied, but the well <br /> opened up after 20 minutes. <br /> am <br /> RECOMMENDATIONS <br /> Existing vapor recovery wells would be sufficient to <br /> remediate the impacted area, but the additional use of <br /> monitoring well Mw-1 would be advantageous. Use of this <br /> well would result in a more direct effect upon the zone <br />